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Definition of tenor for English Language Learners. : the highest adult male singing voice; also : a singer who has such a voice.
âº a form of singing or speaking by men using an extremely high voice: 1  For his role as a young boy, he had to speak in a high falsetto. 2  The lead singer has a falsetto voice. 3  to sing falsetto. 4  He sings a weird falsetto version of Barbara Ann..